f63cfd8e28
Using the new index mask implementation, things can be a bit simpler. It's also simpler to use `complement` instead of `to_ranges_invert`, which just made everything less standard. Also create the new curve offsets in place instead of copying, and use implicit sharing to share attributes when no curves were deleted. With a version of `IndexMask::complement()` optmized locally, I observed the following speedups with a 1.2 million point curve system: - Delete points: 29 FPS -> 45 FPS - Delete curves: 48 FPS -> 49 FPS - Delete tip points: 25 FPS -> 32 FPS Also add a method to apply the "gather" function to all attributes, mostly as a continued experiment of consolidating attribute propagation. This can be used more elsewhere in the future.
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